On 10.08.2010 09:38, Karthik Nanjangude wrote:
Hi
Spec
Java 1.5
O/s : Linux
APP Server : JBOSS4.2.1 (Tomcat built with)
HTTP Server : apache_2.2.11 [ With out SSL ]
Mod library : mod_jk-1.2.28-httpd-2.2.X.so
LB 1 Apache : 1 JBOSS:Port of application
Question : Some times We have observed that on WEB Application ( click on
button in jsp )
Apache is sending 2 POST requests to underlying JBOSS (
Tomcat server ).
Note: We even put a Java script filter to disable multiple Clicks for the page,
How we Observed : Via TCP Thread dump using command "tcpdump -i bond0 -s 1500 -w
/ tmp / test.pcap "
Can this configuration "worker.node1.socket_timeout=10" got any thing to do
with this multiple request activity?
I'm a bit afraid that everyone who was arguing against the above claim
will jump at me but still ...
It could be the missing "recovery_options" setting. See
http://tomcat.apache.org/connectors-doc/reference/workers.html
and do also read a bit about timeouts at
http://tomcat.apache.org/connectors-doc/generic_howto/timeouts.html
If you want to disallow resending any requests in case of communication
errors, you need to set recovery_options to "7", if you want to allow
resending for HEAD and GET, you can use "31".
As others have mentioned we could easily see from your jk log files with
increased log level, whether resending because of errors happens here.
Since you have a 10 second socket_timeout and the two requests are 12
seconds apart, this is likely to happen (10 seconds timeout plus 2
seconds connection draining).
You might want to have a close look at the example config contained in
the mod_jk 1.2.30 source download, which looks better for production
than you config above and is well commented. Note that although that
config uses many timeouts, it does *not* use the general "socket_timeout".
Regards,
Rainer
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